检测Firebase连接是否丢失/重新获得 [英] Detect if Firebase connection is lost/regained

问题描述

有没有一种策略可以在当前的Firebase产品中检测服务器连接是否丢失和/或重新获得？

我正在考虑一些离线意外事件对于移动设备，我希望有一个可靠的方法来确定Firebase数据层何时可用。

解决方案

功能，我们刚刚发布了一个API更新，让你这样做！

  var firebaseRef = new Firebase（'http：// INSTANCE.firebaseio.com'）; 
 firebaseRef.child（'。info / connected'）。on（'value'，function（connectedSnap）{
 if（connectedSnap.val（）=== true）{
 / * * / 
} else {
 / *我们断线！* / 
} 
}）; 
  

完整的文档可在 https://firebase.google.com/docs/database/web/offline-capabilities 。

Is there a strategy that would work within the current Firebase offering to detect if the server connection is lost and/or regained?

I'm considering some offline contingencies for mobile devices and I would like a reliable means to determine when the Firebase data layer is available.

解决方案

This is a commonly requested feature, and we just released an API update to let you do this!

var firebaseRef = new Firebase('http://INSTANCE.firebaseio.com');
firebaseRef.child('.info/connected').on('value', function(connectedSnap) {
  if (connectedSnap.val() === true) {
    /* we're connected! */
  } else {
    /* we're disconnected! */
  }
});

Full docs are available at https://firebase.google.com/docs/database/web/offline-capabilities.

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